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Audi A4
Page 1 of 15
Current Flow Diagram
No. 22 / 1
Edition 04.2005
1.9 l - Unit injectors (74 kW - 4 cylinder), engine code AVB
from model year 2003
1.9 l - Unit injectors (96 kW - 4 cylinder), engine code AVF, AWX
from model year 2003
Main fuse
On the battery
Fuse holder
Driver side dash panel
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Fuse colours
30 A - green
25 A - white
20 A - yellow
15 A - blue
10 A - red
7,5 A - brown
5 A - beige
Note:
From fuse number 23 upwards the fuses in the fuse holder are designated as 223 in the Current Flow Diagram.
Coupling station with screw connection
In electronics box in plenum chamber
1 - 10-pin connector, black (T10)
2 - 10-pin connector, brown (T10a)
3 - 17-pin connector, red (T17d)
6 - 17-pin connector, white (T17e)
Coupling station of A-pillar
Page 2 of 15
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Left bottom behind side trim
14 - 10-pin connector, grey (T10d)
4-point relay carrier
in electronics box in plenum chamber
in electronics box in plenum chamber
1.2 - Fuel pump relay (J17)
2 - Glow plug relay (J52)
3 - Terminal 30 voltage supply relay (J317)
A - Engine electronics fuse (S282)
B - Engine glow plug strip fuse (S39)
Fuse colours
15 A - blue
Page 3 of 15
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80 A - yellow
4-point relay carrier with screw connection
Driver side dash panel
3-point relay carrier
Driver side dash panel
2 - High heat output relay (J360)
3 - Low heat output relay (J359)
B - Auxiliary heater fuse (S126)
C - Auxiliary heater fuse 2 (S328)
Fuse colours
40 A - orange
60 A - light blue
Page 4 of 15
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Note:
The position 1 in the relay carrier is not used.
Page 5 of 15
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Audi A4
Page 6 of 15
No. 22 / 2
Current Flow Diagram
Battery, starter, alternator, voltage regulator,
ignition/starter switch
A
- Battery
B
- Starter
C
- Alternator
C1
- Voltage regulator
D
- Ignition/starter switch
S5
- Fuse in fuse holder
S14
- Fuse in fuse holder
S88
- Strip fuse (main fuse)
S231 - Fuse in fuse holder
T1d
- Single connector, black, left engine
compartment
T2
- 2-pin connector, black, in right engine
compartment
T10a - 10-pin connector, brown, coupling station on
electronics box, plenum chamber
Earth point, in battery box
11
- Screw connection 1 (30), on relay plate
500
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
501
A2
A32
A57
- Screw connection 2 (30), on relay plate
- Positive connection (15), in dash panel wiring
harness
- Positive connection (30), in dash panel wiring
harness
- Positive connection 3 (30), in dash panel wiring
harness
- for models with manual gearbox only
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Audi A4
Page 7 of 15
No. 22 / 3
Current Flow Diagram
Fuel pump relay, diesel direct injection system control
unit, terminal 30 voltage supply relay
J17
- Fuel pump relay
J248 - Diesel direct injection system control unit
J317 - Terminal 30 voltage supply relay
S126 - Auxiliary heater fuse
S228 - Fuse in fuse holder
S286 - Automatic gearbox fuse, run-on
S328 - Auxiliary heater fuse 2
T17e - 17-pin connector, white, coupling station on
electronics box, plenum chamber
Earth point, on left in engine compartment
12
Earth
connection 1, in front right wiring harness
83
A98
D173
F33
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
*
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- Positive connection 4 (30), in dash panel wiring
harness
- Connection (87), in engine wiring harness
- Positive connection (30), in diesel direct
injection system wiring harness
- for models with auxiliary air heater only
- See Current Flow Diagram radiator fan
- for models with automatic gearbox (multitronic
01J) only
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Audi A4
Page 8 of 15
No. 22 / 4
Current Flow Diagram
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
Accelerator position sender, fuel temperature sender,
diesel direct injection system control unit, glow plugs (engine)
F8
- Kick-down switch
F60
- Idling speed switch
G79
- Accelerator position sender
G81
- Fuel temperature sender
J52
- Glow plug relay
J59
- X-contact relief relay
J248 - Diesel direct injection system control unit
J293 - Radiator fan control unit
Q6
- Glow plugs - (engine)
S39
- Engine glow plug strip fuse
T10
- 10-pin connector, black, coupling station on
electronics box, plenum chamber
T10d - 10-pin connector, grey, coupling station on left
of A-pillar
T17d - 17-pin connector, red, coupling station on
electronics box, plenum chamber
T17e - 17-pin connector, white, coupling station on
electronics box, plenum chamber
Earth connection 1, in front right wiring harness
83
A34
D16
- Connection (75x), in dash panel wiring harness
- Connection (glow plugs), in front right wiring
harness
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Audi A4
Page 9 of 15
No. 22 / 5
Current Flow Diagram
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
Charge air pressure sender/ intake manifold
temperature sender, diesel direct injection system
control unit, exhaust gas recirculation valve, charge
pressure control solenoid valve, electrohydraulic
engine mounting
F
- Brake light switch
F36
- Clutch pedal switch
G31
- Charge air pressure sender
G72
- Intake manifold temperature sender
J248 - Diesel direct injection system control unit
J527 - Steering column electronics control unit
N18
- Exhaust gas recirculation valve
N75
- Charge pressure control solenoid valve
N144 - Left electrohydraulic engine mounting solenoid
valve
T10a - 10-pin connector, brown, coupling station on
electronics box, plenum chamber
T16a - 16-pin connector, black, on steering column
electronics control unit
T17e - 17-pin connector, white, coupling station on
electronics box, plenum chamber
Connection (54), in dash panel wiring harness
A18
A104
A154
D172
*
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- Positive connection 2 (15), in dash panel wiring
harness
- Connection (brake pedal switch), in dash panel
wiring harness
- Connection (engine electrics), in engine
compartment wiring harness
- for models with manual gearbox only
- with electrohydraulic engine mounting only
- models with option heater coolant only
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Audi A4
Page 10 of 15
No. 22 / 6
Current Flow Diagram
Hall sender, diesel direct injection system control unit,
variable intake manifold flap change-over valve, unit
injector valves
G40
- Hall sender
J248 - Diesel direct injection system control unit
N79
- Heater element for crankcase breather
N239 - Variable intake manifold flap change-over valve
N240 - Unit injector valve, No. 1 cyl.
N241 - Unit injector valve, No. 2 cyl.
N242 - Unit injector valve, No. 3 cyl.
N243 - Unit injector valve, No. 4 cyl.
S282 - Engine electronics fuse
T8d
- 8-pin connector, in engine compartment
T17d - 17-pin connector, red, coupling station on
electronics box, plenum chamber
Earth connection 1, in front right wiring harness
83
D172
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
- Connection (engine electrics), in engine
compartment wiring harness
- models with option bleeder heating for
crankcase only
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Audi A4
Page 11 of 15
Current Flow Diagram
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
No. 22 / 7
Coolant temperature display sender, engine speed
sender, air mass meter, diesel direct injection system
control unit
G2
- Coolant temperature sender
G28
- Engine speed sender
G62
- Coolant temperature sender
G70
- Air mass meter
J234 - Airbag control unit
J248 - Diesel direct injection system control unit
T3
- 3-pin connector, grey, on engine block
T10a - 10-pin connector, brown, coupling station on
electronics box, plenum chamber
T17d - 17-pin connector, red, coupling station on
electronics box, plenum chamber
Connection (15a, fuse 231), in dash panel
A70
wiring harness
Connection (crash signal), in dash panel wiring
A125
harness
Positive
connection 1 (15), in engine
D51
compartment wiring harness
- Connection (screening), in diesel direct injection
F27
wiring harness
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Audi A4
Page 12 of 15
No. 22 / 8
Current Flow Diagram
Diesel direct injection system control unit, auxiliary air
heater element
J248 - Diesel direct injection system control unit
J359 - Low heat output relay
J360 - High heat output relay
T17d - 17-pin connector, red, coupling station on
electronics box, plenum chamber
Z35
- Auxiliary heating heater element
- Earth point, on left behind dash panel
32
- Earth connection, in heater unit wiring harness
253
F37
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
- Connection (auxiliary heater), in diesel direct
injection system wiring harness
- for models with auxiliary air heater only
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Audi A4
Page 13 of 15
No. 22 / 9
Current Flow Diagram
Diesel direct injection system control unit, automatic
gearbox control unit, control unit with display in dash
panel insert
J217 - Automatic gearbox control unit
J248 - Diesel direct injection system control unit
J285 - Control unit with display in dash panel insert
T10a
T16
T17d
T32a
A76
A121
A122
D159
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
D160
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- 10-pin connector, brown, coupling station on
electronics box, plenum chamber
- 16-pin connector, black, diagnostic connector
- 17-pin connector, red, coupling station on
electronics box, plenum chamber
- 32-pin connector, green, on dash panel insert
- Connection (diagnosis wire K), in dash panel
wiring harness
- Connection (high bus), in dash panel wiring
harness
- Connection (low bus), in dash panel wiring
harness
- Connection (high bus), in engine compartment
wiring harness
- Connection (low bus), in engine compartment
wiring harness
- for models with automatic gearbox (multitronic
01J) only, up to model year 2003
- for models with automatic gearbox (multitronic
01J) only, from model year 2004
- Data bus wire (CAN bus)
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Audi A4
Page 14 of 15
No. 22 / 10
Current Flow Diagram
Control unit with display in dash panel insert, fuel
gauge sender, oil level and oil temperature sender
G
- Fuel gauge sender
G6
- Fuel pump (pre-supply pump)
G169 - Fuel gauge sender 2
G266 - Oil level and oil temperature sender
J285 - Control unit with display in dash panel insert
K2
K29
T10
T10a
T32
T32a
83
249
269
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
A17
A74
- Alternator warning lamp
- Glow period warning lamp
- 10-pin connector, black, coupling station on
electronics box, plenum chamber
- 10-pin connector, brown, coupling station on
electronics box, plenum chamber
- 32-pin connector, blue, on dash panel insert
- 32-pin connector, green, on dash panel insert
- Earth connection 1, in front right wiring harness
- Earth connection 2, in interior wiring harness
- Earth connection (sender earth) 1, in dash panel
wiring harness
- Connection (61), in dash panel wiring harness
- Connection (15a, fuse 5), in dash panel wiring
harness
- for models with four-wheel drive only
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Audi A4
Page 15 of 15
No. 22 / 11
Current Flow Diagram
Control unit with display in dash panel insert, oil
pressure switch, coolant shortage indicator switch
F1
- Oil pressure switch
F66
- Coolant shortage indicator switch
J285 - Control unit with display in dash panel insert
T10
T32
T32a
269
327
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white
black
red
red
brown
green
blue
grey
purple
purple
yellow
orange
pink
- 10-pin connector, black, coupling station on
electronics box, plenum chamber
- 32-pin connector, blue, on dash panel insert
- 32-pin connector, green, on dash panel insert
- Earth connection (sender earth) 1, in dash panel
wiring harness
- Earth connection (sender earth), in engine
compartment wiring harness
